aboutsummaryrefslogtreecommitdiffstats
path: root/toj/center/src/judgk_hyperio.c
blob: 67b0ef6e870af6a6a95a6bf74b118900de22f747 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
#include<linux/fs.h>
#include<linux/tty.h>
#include<linux/slab.h>
#include<linux/mm.h>
#include<linux/wait.h>
#include<linux/sched.h>
#include<asm/atomic.h>
#include<asm/mman.h>

#include"judgk.h"
#include"judgk_com.h"
#include"judgk_hyperio.h"

int judgk_hyperio_init(){
    int i;
    struct hyperio_info *info;

    hyperio_filp_ht = (struct hlist_head*)kmalloc(sizeof(struct hlist_head) * HYPERIO_FILP_HTSIZE,GFP_KERNEL);
    for(i = 0;i < HYPERIO_FILP_HTSIZE;i++){
        INIT_HLIST_HEAD(&hyperio_filp_ht[i]);
    }

    hyperio_table = (struct hyperio_info*)kmalloc(sizeof(struct hyperio_info) * HYPERIO_MAXNUM,GFP_KERNEL);
    for(i = 0;i < HYPERIO_MAXNUM;i++){
        info = &hyperio_table[i];

        atomic_set(&info->ref_count,0);
        info->filp = NULL;
        info->create_flag = false;
        info->end_flag = false;
        info->hook_fops = NULL;
        info->old_fops = NULL;
        
        atomic64_set(&info->read_remain,JUDGK_COM_HYPERIO_BUFSIZE);
        info->read_off = 0;
        info->read_buf = NULL;
        init_completion(&info->read_rwait);
        init_completion(&info->read_wwait);

        atomic64_set(&info->write_remain,JUDGK_COM_HYPERIO_BUFSIZE);
        info->write_off = 0;
        info->write_buf = NULL;
        init_completion(&info->write_rwait);
        init_completion(&info->write_wwait);
    }

    hyperio_tty_drv = tty_alloc_driver(HYPERIO_MAXNUM,TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV);
    hyperio_tty_drv->owner = THIS_MODULE;
    hyperio_tty_drv->driver_name = "judgk_tty";
    hyperio_tty_drv->name = "jtty";
    hyperio_tty_drv->type = TTY_DRIVER_TYPE_SYSTEM;
    hyperio_tty_drv->subtype = SYSTEM_TYPE_TTY;
    hyperio_tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
    hyperio_tty_drv->init_termios = tty_std_termios;
    hyperio_tty_drv->init_termios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
    hyperio_tty_drv->init_termios.c_oflag &= ~OPOST;
    hyperio_tty_drv->init_termios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
    hyperio_tty_drv->init_termios.c_cflag &= ~(CSIZE | PARENB);
    hyperio_tty_drv->init_termios.c_cflag |= CS8;
    tty_set_operations(hyperio_tty_drv,&hyperio_tops);

    tty_register_driver(hyperio_tty_drv);

    return 0;
}
int judgk_hyperio_exit(){
    int i;

    for(i = 0;i < HYPERIO_MAXNUM;i++){
        if(hyperio_table[i].create_flag == true){
            tty_unregister_device(hyperio_tty_drv,i);
            hyperio_table[i].create_flag = false;
        }
    }
    tty_unregister_driver(hyperio_tty_drv);

    return 0;
}
int judgk_hyperio_add(struct file *filp){
    int idx;
    struct hyperio_info *info;

    info = NULL;
    for(idx = 0;idx < HYPERIO_MAXNUM;idx++){
        if(atomic_cmpxchg(&hyperio_table[idx].ref_count,0,1) == 0){
            info = &hyperio_table[idx];
            break;
        }
    }
    if(info == NULL){
        return -1;
    }

    filp->private_data = info;

    info->filp = NULL;
    if(info->create_flag == false){
        tty_port_init(&info->port);
        tty_port_register_device(&info->port,hyperio_tty_drv,idx,NULL);
        info->create_flag = true;
    }
    info->end_flag = false;
    if(info->hook_fops == NULL){
        info->hook_fops = (struct file_operations*)kmalloc(sizeof(struct file_operations),GFP_KERNEL);
    }

    atomic64_set(&info->read_remain,JUDGK_COM_HYPERIO_BUFSIZE);
    info->read_off = 0;
    if(info->read_buf == NULL){
        info->read_buf = kmalloc(JUDGK_COM_HYPERIO_BUFSIZE,GFP_KERNEL);
    }
    memset(info->read_buf,0,JUDGK_COM_HYPERIO_BUFSIZE);
    init_completion(&info->read_rwait);
    init_completion(&info->read_wwait);

    atomic64_set(&info->write_remain,JUDGK_COM_HYPERIO_BUFSIZE);
    info->write_off = 0;
    if(info->write_buf == NULL){
        info->write_buf = kmalloc(JUDGK_COM_HYPERIO_BUFSIZE,GFP_KERNEL);
    }
    memset(info->write_buf,0,JUDGK_COM_HYPERIO_BUFSIZE);
    init_completion(&info->write_rwait);
    init_completion(&info->write_wwait);

    return idx;
}
int judgk_hyperio_read(struct file *filp,size_t len){
    struct hyperio_info *info;
    bool wait_flag;
    size_t remain;

    if((long)len >= 0){
        wait_flag = true;
    }else{
        wait_flag = false;
        len = -(long)len;
    }

    info = (struct hyperio_info*)filp->private_data;

    remain = atomic64_read(&info->write_remain);
    if(unlikely(len > (JUDGK_COM_HYPERIO_BUFSIZE - remain))){
        return -EINVAL;
    }

    if(unlikely(len > 0 && (remain = atomic64_add_return(len,&info->write_remain)) == len)){
        complete(&info->write_wwait);
    }
    if(wait_flag == true){
        while(unlikely(remain == JUDGK_COM_HYPERIO_BUFSIZE)){
            if(info->end_flag == true){
                remain = atomic64_read(&info->write_remain);
                break;
            }
            wait_for_completion_interruptible(&info->write_rwait);
            remain = atomic64_read(&info->write_remain);
        }
    }

    return JUDGK_COM_HYPERIO_BUFSIZE - remain;
}
int judgk_hyperio_write(struct file *filp,size_t len){
    struct hyperio_info *info;
    bool wait_flag;
    size_t remain;

    if((long)len >= 0){
        wait_flag = true;
    }else{
        wait_flag = false;
        len = -(long)len;
    }

    info = (struct hyperio_info*)filp->private_data;

    remain = atomic64_read(&info->read_remain);
    if(unlikely(len > remain)){
        return -EINVAL;
    }

    if(unlikely(len > 0 && (remain = atomic64_sub_return(len,&info->read_remain)) == (JUDGK_COM_HYPERIO_BUFSIZE - len))){
        complete(&info->read_rwait);
    }
    if(wait_flag == true){
        while(unlikely(remain == 0)){
            if(info->end_flag == true){
                remain = atomic64_read(&info->read_remain);
                break;
            }
            wait_for_completion_interruptible(&info->read_wwait);
            remain = atomic64_read(&info->read_remain);
        }
    }

    return remain;
}
int judgk_hyperio_del(struct file *filp){
    struct hyperio_info *info;

    info = (struct hyperio_info*)filp->private_data;
    info->end_flag = true;
    complete(&info->read_rwait);
    complete(&info->read_wwait);
    complete(&info->write_rwait);
    complete(&info->write_wwait);

    atomic_dec(&info->ref_count);
    return 0;
}
int judgk_hyperio_mmap(struct file *filp,struct vm_area_struct *vma){
    unsigned long size;
    unsigned long off;
    void *buf;

    size = vma->vm_end - vma->vm_start;
    off = vma->vm_pgoff << PAGE_SHIFT;
    if((size + off) > JUDGK_COM_HYPERIO_BUFSIZE){
        return -EINVAL; 
    }
    if((vma->vm_flags & VM_READ) != 0 && (vma->vm_flags & VM_WRITE) != 0){
        return -EINVAL;
    }
    if((vma->vm_flags & VM_READ) == 0 && (vma->vm_flags & VM_WRITE) == 0){
        return -EINVAL;
    }

    if((vma->vm_flags & VM_READ) != 0){
        buf = ((struct hyperio_info*)filp->private_data)->write_buf;
    }else{
        buf = ((struct hyperio_info*)filp->private_data)->read_buf;
    }
    remap_pfn_range(vma,
            vma->vm_start,
            virt_to_phys(buf + off) >> PAGE_SHIFT,
            size,
            vma->vm_page_prot);

    return 0;
}

static inline struct hyperio_info* hyperio_filp_lookup(struct file *filp){
    struct hlist_node *node;
    struct hyperio_info *info;

    rcu_read_lock();

    info = NULL;
    hlist_for_each_entry_rcu(info,node,&hyperio_filp_ht[(unsigned long)filp % HYPERIO_FILP_HTSIZE],node){
        if((unsigned long)info->filp == (unsigned long)filp){
            break;
        }
        info = NULL;
    }

    rcu_read_unlock();

    return info;
}
static int hyperio_tty_open(struct tty_struct *tty, struct file *filp){
    struct hyperio_info *info;
    struct file_operations *hook_fops;
    
    tty->low_latency = 1;

    info = &hyperio_table[tty->index];
    atomic_inc(&info->ref_count);
    info->filp = filp;

    hook_fops = info->hook_fops;
    info->old_fops = filp->f_op;
    memcpy(hook_fops,filp->f_op,sizeof(struct file_operations));

    hook_fops->read = hyperio_tty_filpread;
    hook_fops->write = hyperio_tty_filpwrite;

    filp->f_op = hook_fops;

    spin_lock(&hyperio_filp_htlock);

    hlist_add_head_rcu(&info->node,&hyperio_filp_ht[(unsigned long)info->filp % HYPERIO_FILP_HTSIZE]);

    spin_unlock(&hyperio_filp_htlock);

    return 0;
}
static void hyperio_tty_close(struct tty_struct *tty, struct file *filp){
    struct hyperio_info *info;

    info = &hyperio_table[tty->index];
    
    spin_lock(&hyperio_filp_htlock);

    hlist_del_rcu(&info->node);

    spin_unlock(&hyperio_filp_htlock);
    
    filp->f_op = info->old_fops;

    info->end_flag = true;
    complete(&info->read_rwait);
    complete(&info->read_wwait);
    complete(&info->write_rwait);
    complete(&info->write_wwait);

    atomic_dec(&info->ref_count);
}
static int hyperio_tty_write(struct tty_struct *tty,const unsigned char *buf,int count){
    return count;
}
static int hyperio_tty_write_room(struct tty_struct *tty){
    return JUDGK_COM_HYPERIO_BUFSIZE;
}
static ssize_t hyperio_tty_filpread(struct file *filp,char __user *buf,size_t count,loff_t *off){
    struct hyperio_info *info;
    size_t buf_len;
    off_t buf_off;
    size_t remain;
    size_t read_len;
    off_t read_off;

    if(unlikely(count < 0)){
        return -EINVAL;
    }

    info = hyperio_filp_lookup(filp);
    if(unlikely(info == NULL)){
        return -EIO;
    }

    buf_len = count;
    buf_off = 0;
    while(likely(buf_len > 0)){
        while(unlikely((remain = atomic64_read(&info->read_remain)) == JUDGK_COM_HYPERIO_BUFSIZE)){
            if(unlikely(info->end_flag == true)){
                return -EIO;
            }
            if(likely(buf_off > 0)){
                return buf_off;
            }
            wait_for_completion_interruptible(&info->read_rwait);
        }
        if(unlikely(buf_len > (JUDGK_COM_HYPERIO_BUFSIZE - remain))){
            read_len = JUDGK_COM_HYPERIO_BUFSIZE - remain;
        }else{
            read_len = buf_len;
        }

        read_off = info->read_off;
        if(likely((read_len + read_off) < JUDGK_COM_HYPERIO_BUFSIZE)){
            copy_to_user(buf + buf_off,info->read_buf + read_off,read_len); 
            info->read_off = read_len + read_off;
        }else{
            copy_to_user(buf + buf_off,info->read_buf + read_off,JUDGK_COM_HYPERIO_BUFSIZE - read_off); 
            copy_to_user(buf + buf_off + (JUDGK_COM_HYPERIO_BUFSIZE - read_off),info->read_buf,(read_len + read_off) - JUDGK_COM_HYPERIO_BUFSIZE); 
            info->read_off = (read_len + read_off) - JUDGK_COM_HYPERIO_BUFSIZE;
        }

        if(unlikely(atomic64_add_return(read_len,&info->read_remain) == read_len)){
            complete(&info->read_wwait);
        }
        buf_len -= read_len;
        buf_off += read_len;
    }

    return count;
}
static ssize_t hyperio_tty_filpwrite(struct file *filp,const char __user *buf,size_t count,loff_t *off){
    struct hyperio_info *info;
    size_t buf_len;
    off_t buf_off;
    size_t remain;
    size_t write_len;
    off_t write_off;

    if(unlikely(count < 0)){
        return -EINVAL;
    }

    info = hyperio_filp_lookup(filp);
    if(unlikely(info == NULL)){
        return -EIO;
    }

    buf_len = count;
    buf_off = 0;
    while(likely(buf_len > 0)){
        while(unlikely((remain = atomic64_read(&info->write_remain)) == 0)){
            if(unlikely(info->end_flag == true)){
                return -EIO;
            }
            wait_for_completion_interruptible(&info->write_wwait);
        }
        if(unlikely(buf_len > remain)){
            write_len = remain;
        }else{
            write_len = buf_len; 
        }

        write_off = info->write_off;
        if(unlikely((write_len + write_off) >= JUDGK_COM_HYPERIO_BUFSIZE)){
            copy_from_user(info->write_buf + write_off,buf + buf_off,JUDGK_COM_HYPERIO_BUFSIZE - write_off); 
            copy_from_user(info->write_buf,buf + buf_off + (JUDGK_COM_HYPERIO_BUFSIZE - write_off),(write_len + write_off) - JUDGK_COM_HYPERIO_BUFSIZE); 
            info->write_off = (write_len + write_off) - JUDGK_COM_HYPERIO_BUFSIZE;
        }else{
            copy_from_user(info->write_buf + write_off,buf + buf_off,write_len); 
            info->write_off = write_len + write_off;
        }

        if(unlikely(atomic64_sub_return(write_len,&info->write_remain) == (JUDGK_COM_HYPERIO_BUFSIZE - write_len))){
            complete(&info->write_rwait);
        }
        buf_len -= write_len;
        buf_off += write_len;
    }

    return count;
}